Soft suspension spring - long ø medium

The spring that makes a difference in your slot suspension setup

The TT907 is the soft, long, medium-diameter suspension spring from Tectime. An apparently small component that, in the hands of an attentive tuner, can completely transform the way the chassis responds to changes in elevation, curbs, and chicanes on the track.

Function and performance

The stiffness of the suspension spring determines how much resistance the chassis offers to vertical movement. A soft stiffness like that of the TT907 allows the car to better absorb the irregularities of the track, keeping the wheels in contact with the surface for longer. The result is a more stable drive, with less tendency to lose grip in technical sections or on tracks with joins between sections.

The combination of long stroke and medium diameter also defines the available travel and lateral stiffness of the spring. This balance makes it suitable for setups where a progressive response is sought, without abruptness, especially in cars with floating chassis or independent front suspension.

Compatibility and installation

As a spare part from Tectime, it is designed to integrate into the suspension assemblies of this brand. Before installation, it is advisable to check that the dimensions of the housing —inner diameter of the cup and available depth— are compatible with the physical dimensions of this spring. If you are working with chassis from other brands, ensure that the measurements fit before installing it.

• Stiffness: soft
• Length: long
• Diameter: medium
• Reference: TT907
• Brand: Tectime

Tuning and preparation

Working with springs of different stiffness is one of the most accessible and effective adjustments in the preparation of a competitive slot car. As a general rule, soft springs favour stability on technical tracks and on surfaces with more texture, while hard springs provide greater top speed on ovals or very fast and smooth circuits.

Having a selection of springs in different stiffnesses and lengths —like this soft-long medium-diameter TT907— allows you to adjust the car's behaviour between practice sessions without needing to modify the chassis. A real advantage in club sessions where preparation time is limited.

Common mistakes

• Installing the spring without checking the available travel: if the cup is too short, the spring will work compressed and lose effectiveness.
• Combining springs of different stiffness on the same axle: this creates an asymmetric behaviour that is difficult to correct with other adjustments.
• Forgetting preload: a soft spring without the correct preload can cause the suspension to "settle" too quickly and eliminate its damping effect.

Frequently asked questions

What type of track is a soft spring most suitable for?

Soft springs perform better on technical tracks, with many slow corners or irregular surfaces, where maintaining wheel contact with the rail is a priority.

Can I use this spring on a chassis from another brand that is not Tectime?

It is possible as long as the physical dimensions of the spring —outer diameter, inner diameter, and length— are compatible with the chassis housing. Always measure before installing it.

What is the difference between a long spring and a short spring of the same stiffness?

The long spring offers greater suspension travel, meaning more movement before reaching the stop. This can translate into a more progressive impact absorption, although it also requires a housing with more depth.

Is it necessary to change springs frequently?

Suspension springs do not usually degrade quickly under normal usage conditions. However, it is advisable to check them if you notice a change in the car's behaviour, as a fatigued spring loses its nominal stiffness and alters the setup.

What tools do I need for installation?

Generally, a pair of fine-tipped pliers is sufficient, and in some designs, a precision screwdriver to disassemble the suspension assembly. Consult the specific instructions for the Tectime chassis to avoid damaging the spring supports.

The TT907 is a soft, long, medium-diameter suspension spring by Tectime, designed for slot car chassis tuning. Ideal for technical circuits where wheel contact and chassis stability are key, this spring allows progressive suspension response and fine-tuned setup adjustments. A must-have component for slot car preparation, club racing, and competitive slot enthusiasts looking to optimize their chassis behaviour on any track layout.